Julbo Kid's Bubble Sunglasses with Spectron 3+ Lenses The Spectron 3+ lens is a poly-carbonate lens that blocks 88% of the visible light Sipe Grip Tech- Supple, sculpted inserts at the stem ends for excellent hold without sticking to hair Flex System- Articulated hinges at temples for added comfort for various head shapes Curved temples- temples shaped and cut for better hold with sharp and repeated movements Like all Julbo lenses, these lenses are optical category 1, guaranteeing 100% protection against UVA, B and C rays